Nut lock



1,623,355 Aprnl 5, 1927. R; W. SMITH NU'I LOCK Filed April 5. 19 26 X/w a 41W ATTX lNVENTClR- RUFUS W. SMITH, OF TORONTO, ONTARIO, CANADA.

NUT LOCK.

Application flied April 3, 1926, Serial No. 99,556, and in Canada March 9, 1926.

This invention relates to improvements in but locks particularly adapted for railway use, though applicable also to locking nuts to bolts of any type. Briefly my invention comprises a bolt and anut having grooves therein adapted to be brought into co-op erative relationshi to form circular key seats, the grooves eing threaded so that a cylinder key may be screwed therein. By employing two grooves in one part, angularly spaced 90 from one another, and two grooves in the other, diametrically opposite one another,'an adjustment of one-quarter turn of the nut is provided for. The n vention is illustrated in the accompany ng drawings in which v Fig. 1 is a side elevation, partly in section, of a bolt and nut provided with my 1 site.

I grooves 1 an improved lock;

Fig. 2 an end elevation of the'same; Fig. 3 an end elevatlon of the key tool;

and

'Fig. 4 a longitudinal section of the key. In the drawings like numerals of reference indicate corresponding parts in the different figures.

The bolt will be in all respects of the .usual construction for the purpose for which is intended. 'It is, however, pro'vlded at Josite sides with longitudinal semi-circulaw' grooves 1. These are shown as arranged diametrically opposite one another. The nut also is of ordinary type suited for the bolt with which it is used and thisnut is provided with grooves 2 in its'internal periphery arranged to form with. either of the grooves one complete-keyseat of circular section. The grooves '2 are preferably arranged 'at right'angles to one another. The same result, however, could be obtained by 'making the grooves 1 at other' and the grooves 2 diametrically oppo- It will be noted that by turning the nut through. angles of 90 that one of the grooves 1 will always be in alinement with one of the grooves '1' A key 3 isprovided which may be fitted into the ke seats formed b co-acting d 2. This key is t readed-and the keyseats are correspondingl threaded.

As the difi'erent positions of the eyseats are at right anglesto one another,that is, onequarter of a revolution, it will be necessarythat the threads of the key and the keyseats should be of one-quarter the pitch ,of the threads of the bolt itself, as otherwise the tool slipping.

right angles to one ancurity its threads may be pitched in the opposite direction to the threads of the bolt. As the bolts are usually provided with right hand threads, the key will in thatcase be provided with a left hand thread. It will be evident that it is not essential that both the grooves l and 2 should he threaded, as good results can be obtained by threading only one set of grooves, though, it will usually be more satisfactory to thread both.

It will be seen from the cdns'truction described that l. have provided means whereby the nut may be locked to the bolt in positions differing by 90 oi an are, which is usually a sufficiently close adjustment for most purposes.

It will be understood that an desired number of grooves may be emp oyed depending on the fineness of adjustment required. t

To facilitate the operation of the device the key is preferably formed of a tube of and is provided with a driver slot 7 at each end.- ft crank shaped tool 4 is provided having a pin 5 projectin' from one end adapted to enter the bore 0 the key and win s 6 non-rusting material such as Monel metal,

adapted to enter the driver slots of the icy.

This arrangement enables the operator to readily screw inthe key without danger of With a driver slot at each end of the key the operator does not need to pay any particular attention to his lkeys when picking them up, as either end may be entered first into the key seat.

Itis not essential, however, to so form the key, as a solid key may bejused or a key with a slot at one end only.

-What I claim is:' '1. The combination of a bolt and a nut,

one of said .parts having grooves formed therein diametrically opposite one another and parallel to the axis of the bolt and the.

other part;- similar grooves at right angles to one another with which the first mentioned grooves may be brought progressively into engagement to form a key seat; and: a key adapted to fit said key seat, certain of the grooves and the key being threaded, the pitch ,of the thread being one-quarter the pitch of the bolt.

spacing of the,,grooves in one part being difi'erent front the spacing of the grooves in the other part and such that a key seat is formed after equal angular movements of the nut, the pitch of the thread'of the key being proportioned to the thread of the bolt as one step of the said movement of the nut is to a complete revolution.

3. The combination of a bolt and a nut,

having threaded grooves formed therein parallel to the axis of the bolt adapted'when brought into co-operative position to form 'a key seat; a threaded cylindrical key adapted to be screwed into the key seat, a plurality of grooves being formed in one part, the spacing of the grooves eing such that a key seat is formed aftei. equal angular movements of the nut, the pitch of thethread .of the key being proportioned to the thread of the bolt as one stop of the said movement of the nut is to a co'inpiete revolution.

RUFUS wt-smart Signed at Toronto, Canada, this 31st day -of March, 1926. 

